Power press



Feb. 9 ,1926. 1,572,724

, J. E. JOHNSON ET AL POWER PRESS Filed Sep 8, 1923 3 Sheets-Sheet '1 m,5 5 MM m T M? M 0 mJw Fi m w? 5 B w H Feb; 9 192s. 1,572,724

J. E. JOHNSON ET AL POWER PRESS Filed Sept. 1923 3 Sheets-Sheet 2 amaunkm Feb. 9 1926."

J. E. JOHNSON ET AL POWER PRESS Filed Sept. 1923 3 Sheets-Sheet 5INVENTOR Joseph E. Johnson Herberf h. Spel/mafl Patented Feb. 9, 1926.

UNITED. STATES PATENT OFFICE.

- JOSEPH E. JOHNSON AND HERBERT W. SPELLMAN, OF MERIDEN, CONNECTICUT, AS

SIGNORS TO THE CONNECTICUT TELEPHONE & ELECTRIC COMPANY, INCORPO- RATED,OF MERIDEN, CONNECTICUT, A CORPORATION OF CONNECTICUT.

rownnrnnss.

Application filed September 8, 1923., Serial No. 661,590.

To all whom it may concern:

Be it known that we, JOSEPH E. JOHNSON and..HnnBEn'r W. SPELL AN,citizens of the United States of America, residing at Meriden,Connecticut, have invented a new and and is of a type particularlyadapted for molding small articles, such as electrical fittings, etc.

It is anobject of the invention to provide novel means in a power pressfor relieving an excessive pressure which maybe devel' oped during thepressing operation.

It is a further object to provide novel automatically actuated means forejecting a molded article from the press.

It is a further object to provide a manually operable knock-out devicewhich may be used in conjunction with an automatic knock-out device.

Other objects and features of the invention will be apparent as thespecification proceeds. In the drawings .which show, for illustrativepurposes only, a preferred form of the invention-- Fig. 1 is a view infront elevation, with parts shown in section, of a power press em-.

bodying features of our invention;

Fig. 2 is a vertical sectional view taken substantially in the plane ofthe line 2--2 of Fig.1; I V

- Fig. 3 is a horizontal sectional view, taken substantially in theplane of the line 33 of Fig. 1;

Fig. 4 is a sectional view'taken substantially in the plane of the line4-4 of Fig. 1;

Fig. 5 is an enlarged vertical, sectional view of a pressure reliefmeans.

In the form of .power press shown,'1 indicates a suitable base orfoundation portion having the upper frame portion 2 thereon.

On the bed of the press is What may be termed a die-block 3,'having amold or die cavity4 therein. 5 indicates a press platen having asuitable die punch 6 for co-action with the die cavity 4. ./In the frame2 is journaled a crank shaft 7, having a crank 8 for operating the pressplaten through the medium of the connecting rod 9. In the preferred formshown the shaft 7 isprovided with a gear 10, which meshes with a pinion11 on the main driven shaft 12 and suitable means, such as the pulley13, may be used for driving shaft 12. 14 indicates a loose pulley. Apress as thus far described ifs not noveland is, in fact, ofconventional orm.

The press platen in the preferred construction has preferably a tubularextension 15 extending upwardly therefrom, and the extension 15 hasslides 16-16 movable in suitable guidewaysor tracks 17 --17 on the mainframe members 2, for guiding .the platen. The tubular extension in theform shown (see 5) has aplate 18, resting on abutments or lugs 19 formedintegrally with the tubular extension. Concentric coil springs 20 and 21are positioned in the tubular extension and rest upon the plate 18,while a pressure head 22 is slidably fitted in the tubular extension andabuts the upper ends of the springs. A guide rod 23 maypass through anaperture in the plate 18 and serve, in connection with the inside of thetubular extension, to guide the head 22 and prevent the latter frombinding. The upper end of the head 22 has a hemispherical socket 2therein, for the reception of the spherical head 25 on the rod 26forming part of the connecting rod 9. A retaining or cover plate 27 hasa passage therein for the rod 26, and is preferably formed to fit gitspherical head 25, as will be clear from In the preferred form thesprings 20 and 21 are under substantial compression, and the cover plate27 serves as an abutment, against which the head 22 abuts. The plate 27likewise normally maintains the spherical head 25 in engagement with thehead 22. It will be seen that, upon the development of an excessivepressure during the molding ofan article, the spherical head 25 and head22 may move away from the plate 27, that of the springs, and theexcessive pressure will be relieved and breakage of any parts of themachine thus prevented.

The rod 26 forming part 'of the connecting rod is preferably in threadedengagement with a split socket member 30 forming the remaining portionof the connecting rod. A screw 31 may engage the split socket fortightly clamping sition. It will be seen that, since the directconnection between the platen and the rod 26 is through the sphericalhead 25, adjustment may very readily be made by turning the rod, and, ifdesired, the rod 26 may be angularly formed, as at 3 2,\for thereception of a suitable wrench.

By the easy matter to'vary the lower limit of travel of the die punch.Springs of various strengths may be used in the pressure relief deviceand the strength of the spring, as well as the extent to which it iscompressed,

, will determine the pressure at which the spring will yieldto relievethe pressurei The mold or die cavity (Figs; 1 and 2) has a knock-out orejecting head 35. As will be readily understood, this head may form theentire bottom of the mold cavity or may be what is commonly called a diepad. In any event, the knock-out device is provided with a rod 36extending through the block 3-and to theoutside of the bed.

In order to actuate the'knockout rod 36 for causing a molded article, inthe mold cavity to be ejected by the head 35, we provide automatic meansand also preferably manual means, operable independently thereof or inconjunction therewith. In the form shown the crank shaft .7 is providedwith a cam 37 so that, upon each complete rotation of the shaft 7 andthe consequent complete rotation of the crank, which, of course,completes one stroke of the; press, the cam 37 will make one revolution.A follower lever 38 is pivotedto the main frame at 39, and is engaged atoneend by the cam 37 for oscillating the same. The opposite end of thefollower lever 38 may be provided with a plurality of apertures 40' forthe reception of a pin 41 for securing the con necting link 42 thereonin various'.positions along the lever. The opposite cnd of the link 42is provided with a plate 43, having 'an elongated slot 44 therein forthe reception of a pin 45 in one of the apertures 46 in the lever 47.

The lever 47 is pivoted at 48 on a boss 49 on the frame. The end of thelever 47 opposite the link 42 is connect-.

ed by means 0 a link 50 with a lever.'51, secured on the shaft 52. Inthe form shown the lever 51 is formed integrall, with a second lever 53,for a purpose to e described, and both levers are secured on the shaft52. At a point adjacent the rod 36 the shaft 52 is provided with adouble lever having arms the rod 26 in adjusted poadjustment justdescribed it is an said head, whereby, upon a raising of said links, thesaid head, and consequently the knock-out rod 36 and knock-out head 35,

:will be elevated to eject a molded article from the mold cavity.

In conjunction with the-automatic means for actuating the knock-outdevice there nfay be provided a manually operable device.

In the form shown, a hand lever 60 is pivoted to the main foundation orframe at 61. The lever 60 at a point 62 is connected by means of thelink 63 with the lever 53, which is integral with the lever 52 securedin the shaft, so that, upon a raisin of the lever .60, the knock-outhead '35 wlll be elevated in the same manner as when actuated by theautomatic device. If desired, a counter- ,1

weight 64 maybe provided for counterbalancing a part of the weight ofthe knock-out head and associated mechanism and linkage. The operationof the device is as follows: Suitable means, such as an automatic clutch(no-t shown) would be provided forcausing'the press laten to stop atsubstan tially the upper limit of' its stroke, andto remain in suchposition until trip ed by a hand or foot lever, not shown hut well knownto those skilled in the art. After fillingthe mold cavity with moldablecompound the press platen descends so as to cause. the die punch toenter the die cavity and mold the article. If, for any reason, the diecavity is too full'or for any other reason an excessive pressure shouldbe developed during the pressing operation, the springs 2021 in thetubular extension 15 will yield and may thus prevent damage to any partof the machine. It is, .of course, to be understood that springs ofvarious strengths may be put in the tubular extension so that the presswill yield at any desired predetermined point.' When the molded articlehas been formed and the press platen ascends the cam 37 on the crankshaft 7 will actuate the lever 38 whichpthrough the medium of vermechanism, comprising lever 47, link 50, lever 51, shaft 52, bifurcatedlever 54 and links 55, so as to cause the knock-out head 35 to rise andeject the molded article. It will be seen that, if the article, is notproperly ejected by the automatic means before the knockout headdescends, as it will do when the cam is in the position shown in Fig. 2,the hand lever 60 may be used to again raise the knock-out head andeject the molded article. The hand lever 60, as will be clear, operatesthe knock-out through the medium of the link 63, lever 53, shaft 52,bifurcated lever 54 and links 55 connected to the -head 56. The pin andslot connection between and means for confining said head and con--necting rod.

2. In a pressure relief device for a press,

a platen including a tubular extension, a

compression spring in said tubular extension, a head in said extensionand engaging said compression spring, a connecting rod having a ball andsocket connection with said head, and a plate over the end of saidtubular extension and normally engaged by said head and ball and socketconnection.

In a pressure relief device for a press, a platen including a tubularextension, a compressionspring in said tubular extension, a headengaging said spring, a connecting rod connected to said head, and aplate engaging'said head and secured to said tubular extension fornormally maintaining said compression spring under stress.

4. In a pressure reliefdevice for a press, a platen including a tubularextension, a compression spring in said tubular extension, a headengaging said spring, a con necting rod connected to said head, and aplate engaging said head and secured to said .tubular extension fornormally maintaining said compression spring under stress,"sa1d headbeing movable'away from said plate by said connecting rod, tocompresssaid spring.

5. In a press, a member having a'mold cavity therein, a knock-out headin said mold cavity and extending to the outside thereof, a die punch,link mechanism connected to said knock-out, and automatically actuatedoperating means for moving said knockout in said mold cavity forejectinga molded article.

6'; In a press, a member having a mold cavity, a knock-out head in saidcavity and extending to the outside thereof, automatic means connectedto sa'i'd'knock-out head for moving the same to eject a molded articlefromsaid mold cavity, and manual means operable independently of saidautomatic means for movingsaid knock-out head.

7. In a power press, a member having a mold cavity therein, a pressplaten having a die punch for co-acti0n with said mold cavity, aknock-out head in said mold cavity and extending to the outside thereof,a crank shaft and crank for actuating said eject a molded article.

press platen, a cam on said crank shaft, link mechanism actuated by saidcam and connected tosai-d knock-out device for moving" the latter toeject a molded article from said mold cavity, and manual means operableindependently of said cam for ejecting a molded article.

8. In a press, a frame, a member having a mold cavity therein, aknock-out device in said cavity and extending to the outside thereof, apress platen having a die punch for co-action with said mold cavity, acrank shaft journaled insaid frame, a crank for actuating said pressplaten, a cam on said crank shaft, a lever pivoted on said frame andoperable by said cam, a link connected to said lever, and link mechanismconnected to said link with a pin and slot connection, said linkmechanism being connected to said knock-out device and serving to ejecta molded article from said mold cavity.

I 9. In a press, a frame, a member having a mold cavity therein, aknock-out device in said cavity and: extending to the" outside thereof,a press platen having a die punch for co-action with said mold cavity, acrank shaft journal'ed in said frame, a crank for actuating said pressplaten, a cam on said crank shaft, a lever pivoted on said frame andoperable by said crank, a link connected to said lever, link mechanismconnected to said link with a pin and slot connection, said linkmechanism being connected to said knock-out device and serving toeject amolded. article from said mold cavity, and

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manual means connected to said link mechanism for moving said knock-outdevice.

10. In a press, a member having a mold cavity, a knock-out device insaid mold cavity, automatic means foractuating said knock-out forejecting a,molded article, and

manual means for actuating said knock-out said mold cavity, a camoperable by ,said ac-' tuating means, a lever'ope'rable by said cam, almk connected-t0 said lever, lever mechanism connected to saidknock-outdevice and to said link whereby upon actuation of said cam saidknock-out device will be moved to 12. In apress, a frame, a memberhaving a mold cavity therein, a knock-out device, in said mold cavity, alever pivoted on 'Sflld frame, a shaft, a second lever on said shaft,

a knock-out actuating lever on said shaft,

links connecting said last mentioned lever to said knock-out device, andmeans for operating one of said levers for moving said knock-out deviceto ejecta molded article.

" 13. In a press, a frame, a member having a mold cavity therein, aknock-out device in said mold cavity, a 'die punch, crank means foroperating said die punch, a cam operated by said cranknieans, a leverpivoted to said frame and co-acting with and operable by said cam,leveiimechjanism on said frame and connected to said knock-out means foractuating the same, and a link

